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What is ‘ecclesiastical communion,’ which Pope Leo XIV granted to the new Chaldean patriarch?

Pope Leo XIV in St. Peter’s Square at the Vatican, at the general audience on March 25, 2026. | Credit: Daniel Ibáñez/EWTN News
Pope Leo XIV in St. Peter’s Square at the Vatican, at the general audience on March 25, 2026. | Credit: Daniel Ibáñez/EWTN News

Following the procedures for autonomous Eastern Catholic Churches, Pope Leo XIV granted the newly elected patriarch of the Chaldean Catholic Church, Mar Paul III Nona, ecclesiastical communion.

Pope Leo XIV granted ecclesiastical communion to the new patriarch of Baghdad of the Chaldeans, His Beatitude Mar Paul III Nona, who now serves as the head of this Eastern Catholic Church based in Iraq, which is in full communion with Rome.

What is the Chaldean Church?

The Chaldean Church is one of more than 20 Eastern Catholic Churches under the authority of the pope in Rome and possesses autonomy in accordance with Canon 27 of the Code of Canons of the Eastern Churches.

This allows it to manage its internal affairs in accordance with the laws it has established for itself. The Synod of Chaldean Bishops was the body that elected the new patriarch.

What is ecclesiastical communion?

The new patriarch, who succeeds Cardinal Louis Raphael Sako following his resignation, was elected on April 12 and received ecclesiastical communion on April 24, having requested it via a letter sent to Pope Leo, as established by Canon 76 § 2 of the Code of Canons of the Eastern Churches.

“With a heart filled with joy, I grant you ecclesiastica communio as an expression and bond of full communion with the Apostolic See in the common service of unity within the Church and the building up of the body of Christ,” the Holy Father wrote to the new Chaldean patriarch.

Ecclesiastical communion is the formal recognition of full communion with the Diocese of Rome, i.e. with the pope, granted to the one requesting it; in this case, the Chaldean patriarch.

This recognition enables the new patriarch to fully exercise his ministry as the head of the Chaldean Catholic Church, not only within Iraq but also among the diaspora throughout the world.

Once the patriarch, who is “primus inter pares” (“first among equals”) has received ecclesiastical communion, he may convene the synod of bishops of the Church over which he presides and also ordain bishops.

Pope Leo’s message to the new Chaldean patriarch

Pope Leo XIV offered his prayers for the new patriarch and his mission to proclaim the Gospel, “strengthening ecclesial communion within his own territory and in the territories of the diaspora, which is becoming increasingly numerous.”

The Holy Father highlighted that Mar Paul III Nona was elected “on the day when the Chaldean liturgy commemorates the encounter of the risen Christ with St. Thomas, from whom the living tradition of this Church originates.”

For this reason, he encouraged the Chaldeans to persevere as “true believers,” especially in the face of the “exceedingly arduous trials” that the faithful in Iraq and other territories often confront.

This story was first published by ACI Prensa, the Spanish-language sister service of EWTN News. It has been translated and adapted by EWTN News English.

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